Sharp MZ-80B Owner's Manual page 62
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Also See for MZ-80B:
- Owner's manual (138 pages) ,
- Reference manual (94 pages) ,
- Service manual (83 pages)
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53
The
control contents of each port are listed below.:
Port
A
Port
Active
Control
function
terminal
A7
H
Switches addresses $DOOO-$FFFF to V-RAM.
A6
H
Set addresses of V-RAM apparently to $50000-$7FFF
.
As
H
Changes screen to 80-character mode (L: 40-character mode).
A4
L
Tum all key strobe signals to L.
A3
A2
>
Outputs
of strobe signals for keyboard
scan.
AI
Ao
Port
B
Port
Active
Control function
terminal
B7
l
B6
Bs
B4
Data inputs for keyboard scan.
B3
B2
Bl
Bo
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